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208 lines
7.1 KiB
208 lines
7.1 KiB
// Copyright (c) 2001-2011 Joel de Guzman |
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// Copyright (c) 2001-2011 Hartmut Kaiser |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#if !defined(BOOST_SPIRIT_KARMA_KLEENE_MAR_03_2007_0337AM) |
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#define BOOST_SPIRIT_KARMA_KLEENE_MAR_03_2007_0337AM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/karma/domain.hpp> |
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#include <boost/spirit/home/karma/generator.hpp> |
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#include <boost/spirit/home/karma/meta_compiler.hpp> |
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#include <boost/spirit/home/karma/detail/output_iterator.hpp> |
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#include <boost/spirit/home/karma/detail/indirect_iterator.hpp> |
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#include <boost/spirit/home/karma/detail/get_stricttag.hpp> |
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#include <boost/spirit/home/karma/detail/pass_container.hpp> |
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#include <boost/spirit/home/karma/detail/fail_function.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/spirit/home/support/unused.hpp> |
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#include <boost/spirit/home/support/container.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/spirit/home/karma/detail/attributes.hpp> |
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#include <boost/type_traits/add_const.hpp> |
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namespace boost { namespace spirit |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// Enablers |
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/////////////////////////////////////////////////////////////////////////// |
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template <> |
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struct use_operator<karma::domain, proto::tag::dereference> // enables *g |
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: mpl::true_ {}; |
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}} |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace karma |
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{ |
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template <typename Subject, typename Strict, typename Derived> |
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struct base_kleene : unary_generator<Derived> |
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{ |
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private: |
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// Ignore return value in relaxed mode (failing subject generators |
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// are just skipped). This allows to selectively generate items in |
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// the provided attribute. |
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template <typename F, typename Attribute> |
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bool generate_subject(F f, Attribute const&, mpl::false_) const |
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{ |
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bool r = !f(subject); |
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if (!r && !f.is_at_end()) |
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f.next(); |
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return true; |
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} |
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template <typename F, typename Attribute> |
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bool generate_subject(F f, Attribute const&, mpl::true_) const |
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{ |
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return !f(subject); |
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} |
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// There is no way to distinguish a failed generator from a |
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// generator to be skipped. We assume the user takes responsibility |
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// for ending the loop if no attribute is specified. |
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template <typename F> |
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bool generate_subject(F f, unused_type, mpl::false_) const |
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{ |
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return !f(subject); |
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} |
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// template <typename F> |
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// bool generate_subject(F f, unused_type, mpl::true_) const |
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// { |
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// return !f(subject); |
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// } |
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public: |
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typedef Subject subject_type; |
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typedef typename subject_type::properties properties; |
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// Build a std::vector from the subject's attribute. Note |
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// that build_std_vector may return unused_type if the |
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// subject's attribute is an unused_type. |
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template <typename Context, typename Iterator> |
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struct attribute |
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: traits::build_std_vector< |
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typename traits::attribute_of<Subject, Context, Iterator>::type |
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> |
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{}; |
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base_kleene(Subject const& subject) |
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: subject(subject) {} |
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template < |
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typename OutputIterator, typename Context, typename Delimiter |
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, typename Attribute> |
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bool generate(OutputIterator& sink, Context& ctx |
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, Delimiter const& d, Attribute const& attr) const |
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{ |
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typedef detail::fail_function< |
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OutputIterator, Context, Delimiter> fail_function; |
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typedef typename traits::container_iterator< |
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typename add_const<Attribute>::type |
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>::type iterator_type; |
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typedef |
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typename traits::make_indirect_iterator<iterator_type>::type |
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indirect_iterator_type; |
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typedef detail::pass_container< |
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fail_function, Attribute, indirect_iterator_type, mpl::false_> |
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pass_container; |
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iterator_type it = traits::begin(attr); |
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iterator_type end = traits::end(attr); |
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pass_container pass(fail_function(sink, ctx, d), |
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indirect_iterator_type(it), indirect_iterator_type(end)); |
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// kleene fails only if the underlying output fails |
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while (!pass.is_at_end()) |
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{ |
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if (!generate_subject(pass, attr, Strict())) |
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break; |
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} |
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return detail::sink_is_good(sink); |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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return info("kleene", subject.what(context)); |
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} |
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Subject subject; |
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}; |
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template <typename Subject> |
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struct kleene |
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: base_kleene<Subject, mpl::false_, kleene<Subject> > |
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{ |
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typedef base_kleene<Subject, mpl::false_, kleene> base_kleene_; |
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kleene(Subject const& subject) |
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: base_kleene_(subject) {} |
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}; |
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template <typename Subject> |
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struct strict_kleene |
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: base_kleene<Subject, mpl::true_, strict_kleene<Subject> > |
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{ |
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typedef base_kleene<Subject, mpl::true_, strict_kleene> base_kleene_; |
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strict_kleene(Subject const& subject) |
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: base_kleene_(subject) {} |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// Generator generators: make_xxx function (objects) |
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/////////////////////////////////////////////////////////////////////////// |
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namespace detail |
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{ |
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template <typename Subject, bool strict_mode = false> |
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struct make_kleene |
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: make_unary_composite<Subject, kleene> |
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{}; |
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template <typename Subject> |
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struct make_kleene<Subject, true> |
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: make_unary_composite<Subject, strict_kleene> |
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{}; |
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} |
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template <typename Subject, typename Modifiers> |
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struct make_composite<proto::tag::dereference, Subject, Modifiers> |
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: detail::make_kleene<Subject, detail::get_stricttag<Modifiers>::value> |
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{}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject> |
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struct has_semantic_action<karma::kleene<Subject> > |
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: unary_has_semantic_action<Subject> {}; |
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template <typename Subject> |
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struct has_semantic_action<karma::strict_kleene<Subject> > |
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: unary_has_semantic_action<Subject> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<karma::kleene<Subject>, Attribute |
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, Context, Iterator> |
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: mpl::true_ {}; |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<karma::strict_kleene<Subject>, Attribute |
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, Context, Iterator> |
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: mpl::true_ {}; |
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}}} |
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#endif
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